I can help here.
That BBT car looks to be a US export model. In April 1955, US (Canadian as well) cars had the optional bullets and snowflakes with semaphores removed (boxes filled in). In May 1955, all US bound 55's had snowflakes and bullets.
I recently restored my 55 convertible. I can't stress enough how important it is to make sure the convertible is as solid as possible. Unlike a sedan, water can (and does) get in over the years, you won't know it until you take the car apart!
Another thing to be aware of is the cost of doing the top. I bet I have $5,000 wrapped up into my top, by using correct materials and highest quality wood. The effect is outstanding, but it was way more expensive than I had expected.
Regarding the tack strips, original ones are next to impossible to find. Luckily, my Kab at two of the three originals, and I was able to locate the other. But I know people look for years for the correct strips. The repros are junk and require shaping and grinding.
It is worth it in the end. An oval cabrio is probably one of the most beautiful of all VW's in my opinion.
-51 Split Rag
-58 Ghia Cab with Okrasa